There are 6 boxes, 2 of type A and 4 of type B. Type A boxes each contain 2 green marbles and 3 red marbles. Type B boxes each contain 1 green marble and 3 red marbles. A box is selected at random and a marble is drawn from the selected box. Find the probability that a. a red marble is selected,  b. a type A box is chosen given that a red marble is selected.

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Q: In a bag there are 6 white marbles and 16 black marbles. Four marbles are drawn without replacement.…

A:

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